Create PROJECT_STATE.md at repo root with cascade phase table,
decision count, and current sprint. All 18 briefings now reference
this file instead of duplicating the project state paragraph.
Also removes stale content from briefings:
- "v0.2 direction: generator-first" (contradicts D-166 cascade)
- "Sprint 25 generator spike confirmed as critical path" (Phase 5)
- Agent-specific generator prerequisite claims
- Gestalt "v0.2 Pivot" section reframed as "Key Design Pivots"
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
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